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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804901d975b35d615ab9698903be1b293de32d82ebc55cac1099acd3f04c0b5d' 
  AND token = 'BBpMDcT1DpRp8kYxt0wlmTkZlfl8V0JUU7BPdZIlfv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}